SU954714A1 - Gas burner - Google Patents

Description

(54) GAS BURNER

one

The invention relates to heat and power equipment and can be used for burning gaseous fuel in the furnaces of heat-stressed power plants, combustion chambers of gas turbine engines of compressor stations, as well as low-power steam boilers.

Known injection gas burners comprising a housing with a collector installed at the inlet, the inclined nozzles of which are placed between the vanes of the swirler 1.

The disadvantage of this device is unstable combustion and a high content of nitrogen oxides in the combustion products.

Gas burners are also known that contain an air inlet duct with a gas nozzle placed in it and equipped with an acoustic oscillation generator 2.

The known burners provide an intensive small mass gas displacement with air, however, with economical mixture compositions they cause a substantial increase in the content of nitrogen oxides in the combustion products.

The purpose of the invention is to increase the stability of the combustion and reduce the content of nitrogen oxides in the combustion products.

This goal is achieved by the fact that at the outlet the collector nozzles are equipped with gas-jet vortex generators of acoustic oscillations.

FIG. 1 depicts the proposed burner, a longitudinal section; in fig. 2 - swirler, end view; in fig. 3 -

10 a nozzle (longitudinal section) with one embodiment of an acoustic oscillator; in fig. 4 is the same, with another embodiment of the acoustic oscillator.

The gas burner includes a housing 1 s

Claims (2)

 an inlet collector 2, inclined nozzles 3 of which are placed between the swirl blades 4 swirl 5. The nozzles 3 of the collector 2 at the exit are equipped with gas-jet vortex oscillators 6 of acoustic oscillations in which the torsion chamber 7 is connected to the inner nozzle 3 and tangential channels 9. Instead of tangential channels 9, screw channels 10 can be made. To simplify the variation of the frequency range of oscillations generated in generator 6, can be performed These are additional tangential channels 11 or additional screw channels 12 with opposite spin relative to channels 9 or 10, respectively. In this case, the ratio of the length of the twisting chamber and its diameter can vary from the radiator to the radiator in the range of 12-36%. Opel 3 gas manifold is placed in the channels 12, made in the housing 1 and connected to the air source. When air is supplied to the housing 1, and the gas to the collector 2, the air acquires a rotational motion in the swirler 5 and enters the furnace space in the form of spiral-swirling jets separated by vortex traces from the output edges of the blades 4. The e-t jet is blown through nozzles 3 and generators 6 acoustic oscillations in the form of pulsating vortex flares. The vortex flow oriented along their length acquires a spiral shape in the firebox. The pulsating gas forms in the air streams alternating regions of a gas-air mixture of variable composition in time and space, which have different burning times. These irregularities, with air speeds of 80 m / s and 5–20 kHz acoustic frequencies that are typical for burners, are sizes 5–30 mm long and propagate along with spiral streams, breaking down and changing due to intense turbulence of the eddy current in the furnace . When the gas-air mixture is ignited at the first stage, the gas is partially combusted in air in the compositional heterogeneities formed by the generator, and then, as turbulent mixing occurs, combustion of the products of incomplete combustion in each other in the high-temperature stream occurs. The combustion process transforms fluctuations in the composition of the mixture into fluctuations in heat generation and, thus, increases the pressure fluctuations from the generators 6, generating them in the entire combustion zone, which intensifies the combustion process. Since the scale of eddy turbulence, equal to the pitch between the blades 4 of the swirler 5, exceeds the size of the irregularities, the burnout is complete and the organization of the composition inhomogeneities does not reduce the combustion efficiency. Thus, the proposed burner provides two-stage gas combustion, at which the primary combustion zones are lowered in temperature, thereby eliminating the formation of nitrogen winds in them, and afterburning in the vortex flow occurs in the presence of hot combustion products, which intensifies chemical reactions. An inventive gas burner comprising a housing with an inlet manifold, inclined nozzles of which are placed between the swirl blades, characterized in that, in order to increase the stability of the combustion and reduce the nitrogen oxide content in the combustion products, the outlet nozzles are equipped with a gas-jet vortex generators at the outlet, acoustic oscillations Sources of information taken into account during the examination 1. USSR author's certificate No. 180725, cl. F 23 D 13/00, 1964. 2. USSR author's certificate number 409056, cl. F 23 D 15100, 1972. tpue.Z h ////////////////////// Л $ / W //////// L N: Jz